Test values and wear limits for Macan S/Diesel S brake system
WARNING: This page is about a different car, the 2016 Porsche Macan and 2015 Porsche Macan. However, it is still accessible from the selected car via links, so may be relevant.
Information
Depending on the wear of grey cast-iron brake discs, two condition criteria can make replacement necessary:
- Formation of cracks at advanced stage on the brake disc friction surfaces .
- Minimum brake disc thickness is not retained due to wear (material erosion due to friction) . → 465002 CHECKING FRONT BRAKE DISCS (WEAR ASSESSMENT)
| Location | Description | Type | Basic value | Tolerance 1 | Tolerance 2 |
|---|---|---|---|---|---|
| Pad thickness, front | Wear limit 2 mm | approx. 9,68 mm | |||
| Pad thickness, rear | Wear limit 2 mm | approx. 11.6 mm | |||
| Brake disc minimum thickness after machining, front | Only as-new brake discs may be reworked! Only rework the brake disc symmetrically, evenly from both sides! | 33.6 mm | |||
| Brake disc minimum thickness after machining, rear | Only as-new brake discs may be reworked! Only rework the brake disc symmetrically, evenly from both sides! | 21,6 mm | |||
| Brake disc wear dimension, front | 32 mm | ||||
| Brake disc wear dimension, rear | 20 mm | ||||
| Peak-to-valley surface roughness of brake disc after machining, max. | 0.006 mm | ||||
| Thickness tolerance of brake discs after machining, max. | 0.02 mm | ||||
| Lateral runout of brake disc, max. | 0.03 mm | ||||
| Lateral runout of wheel hub, max. | 0.02 mm | ||||
| Lateral runout of brake disc when installed, max. | 0.06 mm |
Possible complaints
- Damage due to lack of use (rusting). This causes vibrations in the steering wheel, noises and brake pedal pulsation.
- Brake disc becomes distorted as a result of serious driving.
- Too much lateral runout when new brake discs are fitted on dirty or distorted wheel hubs.
Procedure
- Check brake disc for cracks, minimum thickness, lateral runout, thickness tolerance, flatness and surface roughness.
- If necessary, (depending on the actual brake disc thickness and the brake disc wear limit) machine the brake disc using one of the disc brake dressing machines approved by Porsche. For a list of recommended disc brake dressing machines, see service information.
- The brake disc must only be reworked symmetrically, i.e. evenly from both sides! Read the operating instructions for the disc brake dressing machine!